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1.05 Multiplication and division by 10 and 100

Lesson

Are you ready?

Can you break a number into its parts, using place value? 

Complete in the number expander for $18522$18522.

  1. $18522$18522 $=$= $\editable{}$ ten thousands $\editable{}$ thousands $\editable{}$ hundreds $2$2 tens $2$2 ones
  2. Write $18522$18522 as a number sentence.
    $\editable{}+\editable{}+\editable{}+20+2$+++20+2

Learn

The digits in our number tell us how many ones, tens, hundreds or thousands (or more!) we have. Remembering that each place is ten times larger than the place to its right can help us when we need to multiply or divide by $10$10.

Apply

Fill in the boxes with the missing numbers.

  1. $4400\div\editable{}=44$4400÷​=44

  2. $44400\div\editable{}=444$44400÷​=444

 

Remember!

When we multiply by $10$10, the digits move to the left one place, and our number gets bigger. We need to put a zero placeholder in the ones place when we multiply by $10$10. When we divide by 10, our digits move to the right one place, and our number gets smaller.

 

Outcomes

5.NBT.A.2

Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.

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